dts: arm: stm32 devices with xspi is named spi node

Fixes the CMake Warning on build/zephyr/zephyr.dts:
Warning (spi_bus_bridge): /soc/xspi@47001400: node name
for SPI buses should be 'spi'

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

dts/arm/st/h5/stm32h562.dtsi

@@ -258,7 +258,7 @@
 			status = "disabled";
 		};
 
-		xspi1: xspi@47001400 {
+		xspi1: spi@47001400 {
 			compatible = "st,stm32-xspi";
 			reg = <0x47001400 0x400>;
 			interrupts = <78 0>;